Pencil sharpener



Patented Oct. 22,V 1935 UNITED STAT-S PENCIL SHARPENER Irwin E. Cohn and Wilfred E. Iait, New York, N. Y.

Application January 28, 1935, Serial No. 3,780

2 Claims.

the type now in use, due to a discovery made by us that a single spiral cutter and a rack racevvay may be so positioned and associated with each other and with an abutment plate opposite the spiral cutter that bodily rotation of the cutter and plate in unison will cause rotation of the cutter by direct engagement of its spirals and. the rack raceway.

The invention will be described with reference to the accompanying drawing, in which Fig. 1 is a view in sectional elevation of an embodiment of the invention, the section being on' the line I-I, Fig. 4.

Fig. 2 is a horizontal section on the line 2 2, Fig. 4.

Fig. 3 is a front end elevation of the device, partly broken away.

Fig. 4 is a Vertical section on the line 4 4, Fig. 3.

The device comprises a base member I of sheet metal which supports the horizontal flanges 2x, 3x, of opposed vertical plates 2 and 3. Plates 2 and 3 are rounded at their top and the edges thereof are inturned to form the flanges a. Plates 2 and 3 are connected by side spacer plates i and top spacer bar 4:1: and a metal drawer 5 is disposed below plates 4. A Celluloid or similar flexible cover rests upon top spacer bar 4r its end extending downwardly and being held by the side spacer plates II, opposed lips at the upper margin of said plates holding the edges of the flexible' cover in position, as shown in Fig. 1.

Mounted upon vertical plate 2 is a circular rack alfording a raceway for the spiral cutter. The rack is stamped from a single piece of sheet metal having a vertical face 'I and peripherally disposed angularly bent arms lar, the end of each arm entering a slot formed in vertical plate 2 and being bent over upon the outer face of said plate, as shown more particularly in Fig. 4.

Concentrically of the rack member 1, plate 2 is formed with a flanged aperture at 8 affording a bearing member for a stud shaft 9 carrying the cutter bracket I0.

The cutter bracket is a U-shaped piece of sheet metal having two arms II and I2, one arm being mounted on shaft 9 and the second arm being mounted on .a sleeve I3 which enters a flanged aperture formed in plate 3 at I4. Bent at right angles to arms II and I2 from bracket I0 are opposed extension flanges- I5 which receive and.

vcomplicated structure.

(Cl. 1Z0-96) support a pencil guide plate I6 having a tapered channel at lex.

Guide plate i6 is opposite a spiral cutter Il rotatably mounted on a pin i8 held by arms I I and i2. The spirals ci cutter il directly engage and therefore mesh with the teeth of annular rack "I, lr, as shown more particularly in Fig. 1.

Threaded upon exposed end of stud shaft 9 is a crank I9 by which cutter bracket I0 may be rotated.

Pencil guiding plate I6 and spiral cutter II are reversely inclined being spaced the maximum distance adjacent sleeve I3. The sleeve receives and guides a pencil and. thus the receiving end of plate i5 is disposed at one side of the sleeve opening and the receiving end of the cutter is disposed opposite thereto and also at the side of the sleeve opening.

By this construction, the entire side of the pencil opposite the cutter is firmly held during the cutting operation, as distinguished from a construction wherein two opposed spiral cutters are used and the two cutters act in opposition by l rotation upon the pencil.

In spite of the simplicity or" our construction, it is found that a better result is obtained through the use of our device than in the use of a more If a pencil is inserted in sleeve I3 and slight pressure imparted thereto during rotation of crank i9, cutting will be initiated and as the tapering of the pencil progresses by the cutter plate it, the pencil will be held rmly and. will be accurately guided relatively to the rotary cutter as the tapering progresses. The pencil being lightly held, it will occasionally be partly rotated b-y the action of the rotary cutter and hence it will be given an even tapered point.

Having described our invention, what we claim and desire to secure by Letters Patent, is as followsz- 1. A pencil Sharpener comprising opposed vertical plates, a sleeve carried by one plate, a stud shaft rotatably carried by the second plate, a handle mounted upon said stud shaft, a bracket comprising a piece of sheet metal having sections at its ends bent to form opposed arms, one arm being mounted on the stud shaft and one arm on the sleeve, a pencil-guiding abutment carried by the bracket at its section intermediate said arms, a spiral toothed cutter rotatably mounted on the arms opposite said abutment, and an annular rack carried by one of said vertical plates and having its teeth directly in mesli with the spirals of said cutter.

directly engaging the teeth Vof the rack, Va pencilguiding abutment carried. by the bracket, a pencil-receiving aperture in one of the bracket arms Y intermediate said `abutmentV and the spiral toothed cutter, a bearing for the bracket, and a pencil-receiving aperture aorded by the second vertical support, and means for rotating the bracket.

' IRWIN E. COHN.

WILFRED E. TAIT.V 10 

